Firefox MathML module does something interesting with invalid markup (Opera too)

This is well-formed and valid:

P ( G | C ) = 32 200 = 0.16

This is well-formed but not valid:

P ( G | C ) = 32 200 extra-not-allowed (Firefox notices, Opera doesn't) = 0.16

And this is not well-formed, served as application/xhtml+xml (AKA "the yellow screen of death" in Firefox)(Opera does something much nicer here.
And here's the same not well-formed document, served as text/html


Henry S. Thompson
Last modified: Thu Feb 19 17:05:19 GMT 2009